“A dead end”

“Fat chance”

Very little or no chance.

“Fight fire with fire”

To use the same methods as your opponent.

“Fit as a fiddle”

Very healthy and strong.

“Food for thought”

Something worth thinking about.

“Fair and square”

Honestly and according to the rules.

“Fill someone’s shoes”

To take over someone’s role or responsibilities.

“Get down to business”

To start focusing on the main work or topic.

“Good things come to those who wait”

Patience can bring good results.